Add project files.

RHLauncher/ProgressThrottler.cs

@@ -0,0 +1,40 @@
+namespace RHLauncher.RHLauncher
+{
+    public class ProgressThrottler : IProgress<ProgressReport>
+    {
+        private readonly IProgress<ProgressReport> _progress;
+        private readonly int _intervalMs;
+        private readonly TaskScheduler _scheduler;
+
+        private readonly object _lock = new();
+        private bool _isScheduled = false;
+        private ProgressReport? _latestReport;
+
+        public ProgressThrottler(IProgress<ProgressReport> progress, int intervalMs)
+        {
+            _progress = progress;
+            _intervalMs = intervalMs;
+            _scheduler = TaskScheduler.FromCurrentSynchronizationContext();
+        }
+
+        public void Report(ProgressReport value)
+        {
+            lock (_lock)
+            {
+                _latestReport = value;
+                if (!_isScheduled)
+                {
+                    _isScheduled = true;
+                    Task.Delay(_intervalMs, _latestReport.CancellationToken).ContinueWith(_ =>
+                    {
+                        lock (_lock)
+                        {
+                            _progress.Report(_latestReport);
+                            _isScheduled = false;
+                        }
+                    }, _latestReport.CancellationToken, TaskContinuationOptions.ExecuteSynchronously, _scheduler);
+                }
+            }
+        }
+    }
+}